Bolt anchor



Sept. 5, 1939. 1 Q MUsHE-r Y 2,171,985

I 'l BOLT ANCHOR Filed July 28, 1938 ///////////ll/m Patented Sept. 5, 1939 BOLT ANCHOR .lames C. Mushet, Roselle Park, N. J., assignor to Star Expansion Bolt Company, New York, N. Y., a corporation of Illinois Application July 28, 1938, Serial N0. 221,690

11 Claims.

This invention relates to bolt anchors, and this application is a continuation in part of application Serial No. 126,369, filed February 18, 1937.

Bolt anchors are used for anchoring bolts in walls of concrete, brick, stone or other cementitious material not adapted to directly receive and anchor threaded elements. When such ancho-rs are to be used a hole must first be drilled or bored into the wall to receive the anchor.

'Ihis invention relates to an anchor, preferably of the tamp in type, comprising an inner member and an outer member or sleeve adapted to be forced longitudinally on the inner member and to be thereby forced laterally into gripping engagement with the Wall opening. This is usual'- ly accomplished by providing a conical or tapered outer surface on a portion of the inner or eX- panding member or element. The invention has for its salient object to provide a bolt anchor element so constructed and arranged that the element can be used to bore or drill the hole in which the anchor is to be used and can. thereafter be used as the inner or expanding element of the anchor.

Further objects of the invention will appear from the following specification taken in connection With the drawing which forms a part of this application, and in which Fig. 1 is a longitudinal sectional elevation of an inner anchor element constructed in accordance with the invention;

Fig. 2 is an elevational view partly in section of a tool constructed for use with they anchor o element shown in Fig. 1;

Fig. 3 is a longitudinal sectional elevation of an outer anchor element adapted for usewith the inner element shown in Fig. 1;

Fig.V 4 is a view similar to Fig. 3 but showing a shorter outer anchor element;

Fig. 5 is a sectional elevation showing a collar for use with the element shown in Fig. 4;

Fig. 6 is an end elevation of the element shown in Fig. 7;

Fig. 7 is a longitudinal sectional elevation similar to Fig. 3 but showing another form of outer or expansible anchor element;

Fig. 8 is `an elevational view partly in section showing the inner anchor element and tool connected together an-d disposed in a hole which has been bored thereby;

' Fig. 9 is aV sectional elevation showing an anchor inserted in the hole prior to the expansion of the outer sleeve or element to set the anchor;

Fig. 10 is a View similar to Fig. 9 but showing the outer anchor element forced laterally into gripping engagement with the wall opening;

Fig. 11 is a View similar to Fig. 9 but showing a shorter outer anchor element or sleevey and a collar mounted on the outer surface of the inner element and engaging the outer end of the sleeve;

Fig. 12 is a view similar to Fig. 11 but showing the collar forced inwardly on the inner element, thereby forcing the sleeve laterally into gripping engagement with the wall opening;

Fig. 13 is a view similar to Figs. 9 and 11 but showing the outer .anchor element or sleeve constructed in the manner shown in Figs. 6 and 7;

Fig. 14 is a view similar to Fig. 13 but showing the outer element expanded or forced laterally into gripping engagement with the wall opening; n Fig. l5 is a sectional elevation of a modified form of Aanchor embodying the invention;

Fig. 16 is an elevational view of a slightly modied form of an inner anchor element `and drill;

Fig. 17 is an end elevation of the element shown .in Fig. `16; v s Fig. 18 is an elevational View similar to Fig. 16, but illustrating a further modification of the invention; and

Fig. 19 is an end elevation of the element shown in Fig. 18.

The invention briefly described consists of an inner anchor element having a longitudinal bore therethrough and having the inner end portion thereof tapered or flared outwardly, or having an abutment formed thereon, the inner end of the element having a cutting edge formed thereon. The inner edge or cutting edge may be con- .tinuous or have cutting teeth formed thereon. The outer end of the bore is threaded and a tool is provided for use with the anchor having a recess,l to receive a portion of the outer surface of the anchor element and having a threaded pin or `stud therein adapted to receive the threaded portion of the bore of the anchor element. When the tool and anchor element are assembled the anchor element will form a drill and can be used to bore a hole inthe wall of concrete, brick, stone or other material, to receive the anchor.

After the hole has been bored the tool and anchor element are separated and an outer expansible sleeve is placed on the inner anchor element and the anchor is inserted on the hole. The tool can then be used to engage the outer end of the expansible sleeve and force this sleeve longitudinally on the inner element and laterally into gripping engagement with the wall opening.

If the Wall opening has a depth substantially equal to the length of the anchor, a short outer sleeve can be assembled on the inner anchor element and a collar can be placed around the outer end of this element. Thereafter the collar can be driven inwardly by blows of a hammer, thus eX- panding the sleeve.

Furthermore, if desired, the outer element can be formed of relatively hard metal with a split inner end which upon engagement with the tapered outer surface of the inner element will eX pand laterally as the sleeve is forced inwardly on the inner anchor element,

Further details of the invention will appear from the following description.

In the embodiment of the invention shown in Figs. 1-14 inclusive, the inner anchor element comprises a hollow body portion 20, preferably cylindrical on its outer surface, and an inner ilared or tapered portion 2 l The inner end of the anchor is preferably cylindrical, as shown at 22, on its outer surface and is tapered, as shown at 23, on its inner surface, forming a V-shaped cutting edge on the inner end of the anchor element. The outer end of the bore is threaded, as shown at 24. Y

The anchor element above described is preferably formed of hard metal, such as hardened steel, in order to serve as a cutting member or drill.

One form of tool adaptedy for use with the anchor element in Fig. 1 is illustrated in Fig. 2 and comprises a holder or rod 25 having a recess 25 at one end thereof. A threaded stud or pin 2'? is mounted in the end of the rod or holder and extends centrally into the recess 25.

The recess 26 is so dimensioned as to receive the cylindrical portion 0I" the body 20 of the anchor element and this element is threaded on the pin 2l', as shown in Fig. 8. The recess 26 is of such a depth as to receive the full length of the cylindrical outer portion of the anchor element and when these parts are assembled the tapered outer surface 2l is disposed outside of the recess and beyond the end of the holder. When the parts are so assembled the combination tool and anchor can be used as a drill to bore a hole 'in thewall in the manner shown in Fig. 8 and in order to gauge the depth of the hole the tool has formed thereon at spaced intervals circumferential grooves 35.

The groove nearest the inner end of the tool indicates the depth to drill the hole for the anchor to be set flush in the hole. By means of the depth gauge the holes can be all drilled to the desired depth and anchors of a group can all be drilled to the same depth to accommodate bolts of the same length. The markings can be spacedto accord with variations in length of standard commercial bolts as, for instance, one-half inch.

When the hole has been bored to the desired depth the tool and anchor element are removed from the hole and the anchor element is rotated in the proper direction to separate the threaded bore i'rorn the pin or stud 2l. Thereupon, the outer anchor element is assembled on the inner element in the manner shown in Fig. 9. The outer element consists of a sleeve 35 having a cylindrical bore 36 adapted to t over the cylindrical outer portion of the inner element and having a tapered inner end 3l adapted to surround and t the tapered inner portion 2l of the inner element. After the anchor has been inserted in the hole in the manner shown in Fig. 9 the tool is again used and in this instance the inner end 38 of the to'ol engages the outer end 39 of the sleeve 35 which is preferably formed of Soft or ductile metal and as the outer end of the tool is tapped with a hammer the sleeve will be forced longitudinally on the inner anchor element and becauseof the engagement of the inner end of the sleeve with the tapered outer surface of the inner anchor element the metal of the sleeve will be forced laterally into rm gripping engagement with the Wall opening and the anchor will be set.

If the hole in the Wall is bored only to a depth corresponding substantially to the length of the anchor, a relatively short sleeve 6E), such as is shown in Fig. 4, can be used. This sleeve is assembled on the inner anchor element and thereafter a collar d! is placed on the outer end of the inner element in engagement with the outer end of the sleeve. The outer end of the collar is then tapped with a hammer which will Yforce the collar inwardly on the inner anchor element and will force the sleeve laterally into gripping engagement with the wall opening. A

If desired, a sleeve such as that shown in Figs. 6 and 7 may be used in conjunction with the inner anchor element. This sleeve d2 has Vits inner tapered portion i3 split, as shown at 4Q, the sleeve in this instance being formed of hard metal. When the sleeve and inner element are assembled as shown in Fig. 13 and inserted in the Wall opening, the outer end of the sleeve can be engaged by a hammer and can thus be forced inwardly to the position shown in Fig. 14 in which it will be seen that the inner end of the sleeve has been expanded into gripping engagement with the Wall opening.

If desired, the inner anchor element may be formed as shown in Fig. l5 with an annular abutment l5 on its outer surface. The sleeve 4S of ductile metal abuts against the abutment 45. Y

in the embodiment of the invention shown in Figs. 16 and 17, the combination expanding anchor element 5B and drill element has teeth 5l on its inner e-nd. These teeth are beveled or tapered as shown at 52, and the inner end of the hollow drill velement is'also tapered or beveled as shown at 53. he teeth 5i are V'shaped and the inner end of the element 5B is conical on its interior and exterior surfaces. When the expansible sleeve on the inner anchor element shown in Figs. 16-19 is forced longitudinally on f ie member 59 or 55 the metal Will be forced into the notches between the teeth Vof the cutting edge, thus effectively locking the shield in expanded position.

In Figs. 18 and 19 a slightly modied form of toothed cutting edge is shown. The element 55 shown in these figures has teeth 56 and arcuate portions 5'lfbetween the teeth. The inner end of the element 55, or cutting edge is beveled as shown at 55.

The anchor elements 2S, 5S and 55 are preferably hardened since this adds to the life of the cutting edge and to the resistance of the element to distortion or crushing When the outer anchor element is tamped and expanded. The combination anchor and drill elements are preferably used with expanding elements such as that shown in Figs. 6 and 7, i. e. of relatively hard metal.

Although certain specic embodiments of the invention have been particularly shown and described, it will be understood that the invention is capable of modification and that changes in the construction and in the arrangement of the Various cooperating parts may be. made Without departing from the spirit or scope of the invention, as expressed in the following claims.

1. A combination hollow drill and inner anchor element comprising a rigid, non-expansible, tubular member having one end portion of its outer surface tapered and having a circumfere'ntial cutting edge on the inner end thereof,A said element having the outer end thereof internally threaded and having the hollow bore extending through the cutting edge.

2. A combination hollow drill and inner anchor element comprising a rigid, non-expansible, tubular member having one end portion of its outer surface tapered and having a V-shaped circumferential cutting edge on the inner end thereof and having the hollow bore extending through the cutting edge.

3. A combination hollow drill and inner anchor element comprising a rigid, non-expansible, tubular member having a substantially cylindrical body portion and one end portion of its outer surface tapered and having a circumferential cutting edge on the inner end thereof and having the hollow bore extending through the cutting edge.

4. A hollow, rigid, non-expansible drill shell having a cutting end comprising a plurality of peripheral points on said end and tapered surfaces between said points, said surfaces extending to and intersecting the core hole of the drill to form arcuate cutting edges, the hollow bore extending through the cutting edge.

5. A hollow, rigid, non-expansible drill shell having a cutting end comprising a plurality of peripheral points on said end and tapered V- shaped surfaces between said points, said surfaces extending to and intersecting the core hole of the drill to form arcuate cutting edges, the hollow bore extending through the cutting edge.

6. A combination hollow drill and anchor element having a conical outer surface at the cutting end thereof, the cutting end being circumferential and comprising a plurality of V-shaped teeth, the hollow bore extending through the cutting edge.

7. A combination hollow, rigid, non-expansible drill and anchor element having a conical outer surface at the cutting end thereof, the cutting end comprising a plurality of V-shaped teeth,

said teeth being beveled and longer at the outer edges thereof than at the inner ends thereof, the hollow bore extending through the cutting edge.

8. In combination, an anchor having an inner element having a portion of its surface outwardly tapered and having a toothed cutting edge on the inner end thereof, and an expansible sleeve on the outer surface, having its inner end contacting said tapered portion, said expansible sleeve being movable longitudinally and laterally relative to said inner element as the sleeve is expanded and portions thereof being adapted to be forced inwardly between the teeth to lock the sleeve and inner element.

9. In combination, an anchor having an inner element having a portion of its surface outwardly tapered and having a toothedcutting edge on the inner end thereof, an expansible sleeve on the outer surface having its inner end contacting said tapered portion, and a member mounted on the inn-er element and engaging the rear end of the sleeve and arranged to force the sleeve longitudinally and laterally on the inner element as the sleeve is expanded, portions of the sleeve being adapted to be forced inwardly between the teeth to lock the sleeve and inner element.

10. An anchor comprising an inner element, outwardly tapered at one end and having a toothed cutting edge on the inner end thereof, and an expansible element mounted on the outer surface of the inner element and movable longitudinally thereon as it is expanded, whereby the sleeve will be forced between the teeth of the cutting edge and will be locked to the inner element.

11. An anchor comprising an inner element having a toothed cutting edge on the inner end thereof, and an expanding element of relatively soft metal mounted on the outer surface of the inner element, the outer diameter of the expanding element prior to expansion of said element being no greater than the outside diameter of the cutting edge, the expanding element being forced longitudinally on the inner element as it is expanded and the soft metal being forced be- 

